WIP:worker and runner cancel flowruns on CANCEL_NEW concurrency strategy

[jeanluciano]

_new

Checklist

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[codspeed-hq]

CodSpeed Performance Report

Merging #15440 will not alter performance

_{Comparing jean/oss-5395-make-workers-aware-of-concurrencyoptions (0be067e) with main (ab6c49d)}

Summary

✅ 3 untouched benchmarks